1.

A can do a piece of work in 10 days and B can do it in 15 days and C can do it 20 days. They started the work together and A leaves after 2 days and B leaves after 4 days from the beginning. How long

Answer»

10 2/3 days



2/10 + 4/15 + x/20 = 1

x = 32/3 = 10 2/3



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